Missing a map from a recent bicycle ride

I’m missing a map from a recent bicycle ride. Can I copy a previous map to this workout?

I’m not sure I fullly understand.

If you see only “blue track activity” and no map background then please turn on Internet connection to download map data.
If you somehow didn’t save your activity since 3.x app version inside app settings -> backup and restore -> there is garbage section where you can restore some deleted or unsaved activities.